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Date: Sat, 20 Jul 2013 06:55:29 +0300
From: Mauro Carvalho Chehab <mchehab@...radead.org>
To: Borislav Petkov <bp@...en8.de>
Cc: Tony Luck <tony.luck@...el.com>,
linux-edac <linux-edac@...r.kernel.org>,
Markus Trippelsdorf <markus@...ppelsdorf.de>,
Ming Lei <tom.leiming@...il.com>, Linda Walsh <lkml@...nx.org>,
LKML <linux-kernel@...r.kernel.org>, Borislav Petkov <bp@...e.de>
Subject: Re: [PATCH -v2] EDAC: Fix lockdep splat
Em Fri, 19 Jul 2013 12:28:25 +0200
Borislav Petkov <bp@...en8.de> escreveu:
> From: Borislav Petkov <bp@...e.de>
>
> Fix the following:
>
> BUG: key ffff88043bdd0330 not in .data!
> ------------[ cut here ]------------
> WARNING: at kernel/lockdep.c:2987 lockdep_init_map+0x565/0x5a0()
> DEBUG_LOCKS_WARN_ON(1)
> Modules linked in: glue_helper sb_edac(+) edac_core snd acpi_cpufreq lrw gf128mul ablk_helper iTCO_wdt evdev i2c_i801 dcdbas button cryptd pcspkr iTCO_vendor_support usb_common lpc_ich mfd_core soundcore mperf processor microcode
> CPU: 2 PID: 599 Comm: modprobe Not tainted 3.10.0 #1
> Hardware name: Dell Inc. Precision T3600/0PTTT9, BIOS A08 01/24/2013
> 0000000000000009 ffff880439a1d920 ffffffff8160a9a9 ffff880439a1d958
> ffffffff8103d9e0 ffff88043af4a510 ffffffff81a16e11 0000000000000000
> ffff88043bdd0330 0000000000000000 ffff880439a1d9b8 ffffffff8103dacc
> Call Trace:
> dump_stack
> warn_slowpath_common
> warn_slowpath_fmt
> lockdep_init_map
> ? trace_hardirqs_on_caller
> ? trace_hardirqs_on
> debug_mutex_init
> __mutex_init
> bus_register
> edac_create_sysfs_mci_device
> edac_mc_add_mc
> sbridge_probe
> pci_device_probe
> driver_probe_device
> __driver_attach
> ? driver_probe_device
> bus_for_each_dev
> driver_attach
> bus_add_driver
> driver_register
> __pci_register_driver
> ? 0xffffffffa0010fff
> sbridge_init
> ? 0xffffffffa0010fff
> do_one_initcall
> load_module
> ? unset_module_init_ro_nx
> SyS_init_module
> tracesys
> ---[ end trace d24a70b0d3ddf733 ]---
> EDAC MC0: Giving out device to 'sbridge_edac.c' 'Sandy Bridge Socket#0': DEV 0000:3f:0e.0
> EDAC sbridge: Driver loaded.
>
> What happens is that bus_register needs a statically allocated lock_key
> because the last is handed in to lockdep. However, struct mem_ctl_info
> embeds struct bus_type (the whole struct, not a pointer to it) and the
> whole thing gets dynamically allocated.
>
> Fix this by using a statically allocated struct bus_type for the MC bus.
>
> Cc: Mauro Carvalho Chehab <mchehab@...radead.org>
Acked-by: Mauro Carvalho Chehab <mchehab@...radead.org>
But see below.
> Cc: Markus Trippelsdorf <markus@...ppelsdorf.de>
> Signed-off-by: Borislav Petkov <bp@...e.de>
> ---
> drivers/edac/edac_mc.c | 9 +++++++++
> drivers/edac/edac_mc_sysfs.c | 28 +++++++++++++++-------------
> drivers/edac/i5100_edac.c | 2 +-
> include/linux/edac.h | 7 ++++++-
> 4 files changed, 31 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
> index 27e86d938262..c55ad285c285 100644
> --- a/drivers/edac/edac_mc.c
> +++ b/drivers/edac/edac_mc.c
> @@ -48,6 +48,8 @@ static LIST_HEAD(mc_devices);
> */
> static void const *edac_mc_owner;
>
> +static struct bus_type mc_bus[EDAC_MAX_MCS];
> +
> unsigned edac_dimm_info_location(struct dimm_info *dimm, char *buf,
> unsigned len)
> {
> @@ -723,6 +725,11 @@ int edac_mc_add_mc(struct mem_ctl_info *mci)
> int ret = -EINVAL;
> edac_dbg(0, "\n");
>
> + if (mci->mc_idx >= EDAC_MAX_MCS) {
> + pr_warn_once("Too many memory controllers: %d\n", mci->mc_idx);
> + return ret;
Hmm... while I'm ok with returning -EINVAL, maybe instead it could be
returning some other error more meaningful error code (ENODEV?).
> + }
> +
> #ifdef CONFIG_EDAC_DEBUG
> if (edac_debug_level >= 3)
> edac_mc_dump_mci(mci);
> @@ -762,6 +769,8 @@ int edac_mc_add_mc(struct mem_ctl_info *mci)
> /* set load time so that error rate can be tracked */
> mci->start_time = jiffies;
>
> + mci->bus = &mc_bus[mci->mc_idx];
> +
> if (edac_create_sysfs_mci_device(mci)) {
> edac_mc_printk(mci, KERN_WARNING,
> "failed to create sysfs device\n");
> diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
> index ef15a7e613bc..e7c32c4f7837 100644
> --- a/drivers/edac/edac_mc_sysfs.c
> +++ b/drivers/edac/edac_mc_sysfs.c
> @@ -370,7 +370,7 @@ static int edac_create_csrow_object(struct mem_ctl_info *mci,
> return -ENODEV;
>
> csrow->dev.type = &csrow_attr_type;
> - csrow->dev.bus = &mci->bus;
> + csrow->dev.bus = mci->bus;
> device_initialize(&csrow->dev);
> csrow->dev.parent = &mci->dev;
> csrow->mci = mci;
> @@ -605,7 +605,7 @@ static int edac_create_dimm_object(struct mem_ctl_info *mci,
> dimm->mci = mci;
>
> dimm->dev.type = &dimm_attr_type;
> - dimm->dev.bus = &mci->bus;
> + dimm->dev.bus = mci->bus;
> device_initialize(&dimm->dev);
>
> dimm->dev.parent = &mci->dev;
> @@ -975,11 +975,13 @@ int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
> * The memory controller needs its own bus, in order to avoid
> * namespace conflicts at /sys/bus/edac.
> */
> - mci->bus.name = kasprintf(GFP_KERNEL, "mc%d", mci->mc_idx);
> - if (!mci->bus.name)
> + mci->bus->name = kasprintf(GFP_KERNEL, "mc%d", mci->mc_idx);
> + if (!mci->bus->name)
> return -ENOMEM;
> - edac_dbg(0, "creating bus %s\n", mci->bus.name);
> - err = bus_register(&mci->bus);
> +
> + edac_dbg(0, "creating bus %s\n", mci->bus->name);
> +
> + err = bus_register(mci->bus);
> if (err < 0)
> return err;
>
> @@ -988,7 +990,7 @@ int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
> device_initialize(&mci->dev);
>
> mci->dev.parent = mci_pdev;
> - mci->dev.bus = &mci->bus;
> + mci->dev.bus = mci->bus;
> dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
> dev_set_drvdata(&mci->dev, mci);
> pm_runtime_forbid(&mci->dev);
> @@ -997,8 +999,8 @@ int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
> err = device_add(&mci->dev);
> if (err < 0) {
> edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev));
> - bus_unregister(&mci->bus);
> - kfree(mci->bus.name);
> + bus_unregister(mci->bus);
> + kfree(mci->bus->name);
> return err;
> }
>
> @@ -1064,8 +1066,8 @@ fail:
> }
> fail2:
> device_unregister(&mci->dev);
> - bus_unregister(&mci->bus);
> - kfree(mci->bus.name);
> + bus_unregister(mci->bus);
> + kfree(mci->bus->name);
> return err;
> }
>
> @@ -1098,8 +1100,8 @@ void edac_unregister_sysfs(struct mem_ctl_info *mci)
> {
> edac_dbg(1, "Unregistering device %s\n", dev_name(&mci->dev));
> device_unregister(&mci->dev);
> - bus_unregister(&mci->bus);
> - kfree(mci->bus.name);
> + bus_unregister(mci->bus);
> + kfree(mci->bus->name);
> }
>
> static void mc_attr_release(struct device *dev)
> diff --git a/drivers/edac/i5100_edac.c b/drivers/edac/i5100_edac.c
> index 1b635178cc44..157b934e8ce3 100644
> --- a/drivers/edac/i5100_edac.c
> +++ b/drivers/edac/i5100_edac.c
> @@ -974,7 +974,7 @@ static int i5100_setup_debugfs(struct mem_ctl_info *mci)
> if (!i5100_debugfs)
> return -ENODEV;
>
> - priv->debugfs = debugfs_create_dir(mci->bus.name, i5100_debugfs);
> + priv->debugfs = debugfs_create_dir(mci->bus->name, i5100_debugfs);
>
> if (!priv->debugfs)
> return -ENOMEM;
> diff --git a/include/linux/edac.h b/include/linux/edac.h
> index 0b763276f619..5c6d7fbaf89e 100644
> --- a/include/linux/edac.h
> +++ b/include/linux/edac.h
> @@ -622,7 +622,7 @@ struct edac_raw_error_desc {
> */
> struct mem_ctl_info {
> struct device dev;
> - struct bus_type bus;
> + struct bus_type *bus;
>
> struct list_head link; /* for global list of mem_ctl_info structs */
>
> @@ -742,4 +742,9 @@ struct mem_ctl_info {
> #endif
> };
>
> +/*
> + * Maximum number of memory controllers in the coherent fabric.
> + */
> +#define EDAC_MAX_MCS 16
> +
> #endif
Cheers,
Mauro
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